 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.text.edits;

 import org.eclipse.core.runtime.Assert;

 import org.eclipse.jface.text.BadLocationException;
 import org.eclipse.jface.text.IDocument;

 /**
  * Text edit to replace a range in a document with a different
  * string.
  *
  * @since 3.0
  */
 public final class ReplaceEdit extends TextEdit {

     private String fText;

     /**
      * Constructs a new replace edit.
      *
      * @param offset the offset of the range to replace
      * @param length the length of the range to replace
      * @param text the new text
      */
     public ReplaceEdit(int offset, int length, String text) {
         super(offset, length);
         Assert.isNotNull(text);
         fText= text;
     }

     /*
      * Copy constructor
      *
      * @param other the edit to copy from
      */
     private ReplaceEdit(ReplaceEdit other) {
         super(other);
         fText= other.fText;
     }

     /**
      * Returns the new text replacing the text denoted
      * by the edit.
      *
      * @return the edit's text.
      */
     public String getText() {
         return fText;
     }

     /*
      * @see TextEdit#doCopy
      */
     protected TextEdit doCopy() {
         return new ReplaceEdit(this);
     }

     /*
      * @see TextEdit#accept0
      */
     protected void accept0(TextEditVisitor visitor) {
         boolean visitChildren= visitor.visit(this);
         if (visitChildren) {
             acceptChildren(visitor);
         }
     }

     /*
      * @see TextEdit#performDocumentUpdating
      */
     int performDocumentUpdating(IDocument document) throws BadLocationException {
         document.replace(getOffset(), getLength(), fText);
         fDelta= fText.length() - getLength();
         return fDelta;
     }

     /*
      * @see TextEdit#deleteChildren
      */
     boolean deleteChildren() {
         return true;
     }

     /*
      * @see org.eclipse.text.edits.TextEdit#internalToString(java.lang.StringBuffer, int)
      * @since 3.3
      */
     void internalToString(StringBuffer buffer, int indent) {
         super.internalToString(buffer, indent);
         buffer.append(" <<").append(fText); //$NON-NLS-1$
 }
 }

